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y = mi edad
x = 4 + (y)²
x = (y + 1)² -5
4 + y² = (y + 1)² - 5
4 + y² = y² +2y +1 - 5
2y = 8
y = 4
x = 4 + (4)²
x = 4 + 16
x= 20